CN100590937C - Multifunctional fireproofing over loading protecting socket - Google Patents
Multifunctional fireproofing over loading protecting socket Download PDFInfo
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- CN100590937C CN100590937C CN200610053983A CN200610053983A CN100590937C CN 100590937 C CN100590937 C CN 100590937C CN 200610053983 A CN200610053983 A CN 200610053983A CN 200610053983 A CN200610053983 A CN 200610053983A CN 100590937 C CN100590937 C CN 100590937C
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Abstract
The invention relates to a multifunctional fireproof overload protective plug base, which comprises over-current sensor on circuit board, zero-sequence inducer, test button, return button element, control circuit, electromagnetic release device, two couples of stable contactor and movable contactor relative to N and L poles, and one stable magnet fixed on frame. The invention uses dual-magnetic release method to switch the contactors, without mechanical abrasion and sliding condition. And it has high current divert ability and high sensitivity. It has overload protection and leakage protectionfunctions.
Description
Technical field
The present invention relates to a kind of highly sensitive multifunctional fireproofing over loading protecting socket, is a kind of multi-functional fire prevention universal power supply sockets such as overload protection, overvoltage protection, overtemperature protection, earth leakage protective and short-circuit protection that have.
Background technology
Along with science and technology development, the supply socket with fire-proof function is required for people gradually, provides the reliability guarantee for protecting property safeties such as the person and electrical equipment.Fireproofing over loading protecting socket installs overload protective device additional and realizes in described supply socket.Existing overload protective device mainly adopts bimetal leaf; thereby make its flexural deformation realize cutting off the electricity supply after the energising heating, when one times of electric current of overload, generally needed to trip in several seconds to half an hour; thereby deenergization fast, and break-time is influenced by environmental temperature.When electrical appliance transships for a certain reason, electrical heating, on fire, even after burning, overload protective device does not also have the phenomenon of tripping operation to happen occasionally, thereby does not have effective protective effect.Special in the small household appliance of rated current below 1A, its defective is more obvious.Simultaneously, existing flameproof protection socket has only single overload protection function.
Summary of the invention
The above-mentioned defective that prior art that the present invention will solve exists, provide that a kind of tripping force is big, quick action, highly sensitive, reliability is high and the fireproofing over loading protecting socket that has creepage protection function concurrently.
The present invention also will provide a kind of multifunctional fireproofing over loading protecting socket with over-voltage protecting function.
The present invention also will provide a kind of multifunctional fireproofing over loading protecting socket with overheat protective function.
The present invention also will provide a kind of multifunctional fireproofing over loading protecting socket with anti-surge defencive function.
The present invention also will provide a kind of multifunctional fireproofing over loading protecting socket with short-circuit protection function.
The present invention also provides a kind of micro high sensitivity over-current sensor that we newly develop.
The technical scheme that addresses the above problem employing is: multifunctional fireproofing over loading protecting socket; comprise the over-current sensor, zero-sequence transformer, test button, reset button assembly, control circuit, the magnetictrip that are arranged on the circuit board, correspond respectively to the two pairs of static contacts and the movable contact spring of the N utmost point and the L utmost point; and a static magnet that is fixed on the shell, it is characterized in that:
Described reset button assembly comprises reset button, connecting rod and the moving magnet that connects successively, is set with back-moving spring on the described connecting rod; Described magnetictrip comprises coil, coil rack and iron core, and by an insulation board and described movable contact spring interlock; Described each movable contact spring one end is provided with a moving contact, the other end of L utmost point movable contact spring forms L utmost point power connector end after passing zero-sequence transformer and over-current sensor directly or by lead, and the other end of N utmost point movable contact spring forms N utmost point power connector end after passing zero-sequence transformer directly or by lead; One end of described each static contact is arranged on the circuit board, and the other end is provided with the fixed contact of relative configuration with described moving contact, and L utmost point static contact is electrically connected with L utmost point jack, and N utmost point static contact is electrically connected with N utmost point jack; Described iron core two ends are relative with static magnet and moving magnet respectively, and described static magnet is identical with the polarity of moving magnet one side in opposite directions, the state that iron core and magnetostatic iron phase were inhaled when described coil was arranged in energising, and described moving magnet magnetic is better than described static magnet.
Multifunctional fireproofing over loading protecting socket of the present invention; its mechanical part is realized disconnecting and resetting by the electromagnetic force between magnetictrip and static magnet and the moving magnet; replaced the mechanical engagement between the iron core and connecting rod in the traditional protection device; thereby can not produce mechanical wear and slide fastener phenomenon; make dropout more reliable, and the contact contact pressure is big, contact resistance is little, is difficult for heating; the ability of breaking current is big, and is highly sensitive.
What is more important, multifunctional fireproofing over loading protecting socket of the present invention has adopted over-current sensor and zero-sequence transformer simultaneously, thereby has overload protection and creepage protection function concurrently.Zero-sequence transformer is used to detect leakage current, and phase line of power and center line all pass zero-sequence transformer, and in the secondary winding access control circuit of zero-sequence transformer.Electrical equipment is when operate as normal, because the current value of phase line and center line is identical, magnetic direction is opposite, cancels out each other in magnetic field, and the induced voltage in the secondary winding of zero-sequence transformer is zero, and control circuit is failure to actuate.When leakage current appears in circuit, the current value of phase line of power and center line is unequal, will induce faint electric leakage signal voltage in the secondary winding of zero-sequence transformer like this, when this induced signal voltage reached setting value, control circuit triggered the controllable silicon deenergization.
Over-current sensor of the present invention is also different with traditional current transformer, and traditional current transformer is that former limit winding is inserted power supply, induces measuring current at the secondary winding.And over-current sensor of the present invention is not established former limit winding, and phase line of power is directly passed current transformer.When electric current surpasses rated operational current, will induce faint signal voltage at the secondary of over-current sensor.When this induced signal voltage reached setting value, control circuit triggered the controllable silicon deenergization.Owing to omitted former limit winding; thereby protection socket volume of the present invention can design very for a short time; and because over-current sensor just can play supervisory function bit when no-voltage is above; thereby reaction is sensitiveer; especially be applied to the small household appliance of rated current below 1A, its advantage is more remarkable.
As a further improvement on the present invention, in the slideway that described reset button assembly inlay card is offered on circuit board.Like this, reset button, connecting rod and moving magnet can reinstall circuit board after being assembled into one, and both convenient the installation can guarantee the reliable connection between each parts again.
Further improve as of the present invention, described static contact also is provided with terminal screw, can be advantageously connected to corresponding jack by lead again.
Further improve as of the present invention, described control circuit comprises and is used to receive the signal of telecommunication of described zero-sequence transformer and over-current sensor secondary winding and the control chip IC of triggering signal is exported in the back that compares, amplifies, overturn and the controllable silicon of conducting electromagnetic assembly coil under the effect of control chip IC triggering signal again.
Described control chip IC can be any standard structure, and preferred 54123 series are any as VG54123, SC54123, LF54123, XN54123, M54123 etc., preferred VG54123 type.Secondary winding one end of described zero-sequence transformer is connected to 3 pin of control chip IC and an end of anti-surge switch, the other end links to each other with the positive pole of partiting dc capacitor and an end of first divider resistance, the negative pole of described partiting dc capacitor is connected to 1 pin of control chip IC and an end of second divider resistance, and the other end of described second divider resistance is connected to 7 pin of control chip; One end of the secondary winding of described over-current sensor links to each other with the other end of anti-surge switch, is connected the anti-surge diode of a pair of reverse parallel connection between the other end of the other end and first divider resistance; 4 pin and 5 pin of described control chip IC connect silicon controlled negative pole and control end respectively, connect the power supply phase line behind the main tripping coil of the anodal series connection of described silicon controlled electromagnetism tripping coil.Described a pair of anti-surge diode, protection control chip IC is not damaged when circuit produces overvoltage surge.Described anti-surge switch is a normally closed switch, produces the moment disconnection at overvoltage surge, automatically resets again then.
Be provided with anti-interference capacitor between 5 pin of described control chip IC and 4 pin.This anti-interference capacitor adopts electrochemical capacitor, and after 4 pin and 5 of control chip IC produced a signal voltage trigger voltage signal, under the effect of anti-interference capacitor, the voltage at electric capacity two ends rose gradually.If this signal voltage is the disturbing pulse signal, then before the voltage at electric capacity two ends reaches the silicon controlled trigger voltage as yet, just do not disappeared, thereby controllable silicon can triggering and conducting, can avoid misoperation.
The secondary winding two ends of described zero-sequence transformer connect first voltage-stabiliser tube, and the secondary winding two ends of described over-current sensor connect second voltage-stabiliser tube.When circuit produced overvoltage surge, the secondary winding of described voltage-stabiliser tube protection zero-sequence transformer and over-current sensor was not damaged.
Further improve as of the present invention again, connect the main tripping coil of an electromagnetic trip coil between power supply phase line and controllable silicon positive pole, the silicon controlled negative pole connects the negative pole of rectifier bridge, thereby constitutes the loop that the positive half cycle of alternating current passes through.Described short circuit tripping coil is one of them coil of electromagnetic trip coil, and is wound on the coil rack.Described short circuit tripping coil and main tripping coil can be two independently coils, also can be the two parts with tapped same coil.
Further improve as of the present invention, the bimetallic of also connecting on the power supply phase line is crossed thermal overload release K switch 2 again, realizes dual-overload protection.
Further improve as of the present invention, the power supply phase line is connected to the input of a full-wave rectifying circuit simultaneously again, operating voltage is provided for when operate as normal described control chip IC.Be connected to 6 pin of control chip behind the positive termination current-limiting resistance of described full-wave rectifying circuit, negative terminal connects 4 pin of control chip.Also connect a filter capacitor between 6 pin of described control chip and 4 pin, make the operating voltage of control chip more stable.
Further improve as of the present invention, the two ends of passing zero-sequence transformer in phase line connect an analog leakance test circuit.The switch series connection of simulation leak resistance and test button constitutes; Analog leakance test circuit two ends are connected across simultaneously to be passed on the zero-sequence transformer center line in front, and the other end is connected across on the phase line of passing the zero-sequence transformer back.In the two ends of the test button switch thermistor in parallel and second piezo-resistance.Supply voltage just often, test button disconnects, the thermistor and second piezo-resistance are high-impedance state; When supply voltage is higher than rated voltage, or surge voltage and thunderstorm hour arranged, second piezo-resistance moment was low resistive state, be equivalent to press test button, analog leakance test, the electric current that passes the phase line of zero-sequence transformer and center line is just unequal, secondary in zero-sequence transformer will induce faint voltage signal, amplify through IC, relatively, upset triggers the controllable silicon conducting for high level by the output of 5 pin, the positive half cycle that makes alternating current is by the electromagnetic trip coil, produce identical with moving magnet magnetic field, the electromagnetic field opposite with static magnet magnetic field threaded off electromagnetic trip mechanism rapidly, deenergization.
When circuit produces when overheated, correspondingly, thermistor, then also conducting of analog leakance test circuit, the conducting that is triggered of control circuit controllable silicon, electromagnetic trip mechanism threads off rapidly, deenergization.
In order to guarantee control chip when the overvoltage or have thunderstorm hour not burnt out, at the power end of described full-wave rectifying circuit one first piezo-resistance RV1 in parallel.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a mechanical structure schematic diagram of the present invention.
The upward view of Fig. 2 Fig. 1.
Fig. 3 is the circuit diagram of control circuit of the present invention.
Fig. 4 is the mechanical structure schematic diagram of over-current sensor of the present invention.
Embodiment
With reference to Fig. 1,2, multifunctional fireproofing over loading protecting socket, with circuit board 1 as substrate.Circuit board 1 is provided with over-current sensor 12, zero-sequence transformer 13, test button 9, the reset button assembly, magnetictrip, correspond respectively to the two pairs of static contacts 22 and the movable contact spring 14 of the N utmost point and the L utmost point, the control chip 7 of control circuit, controllable silicon 8 and other elements, and a static magnet 17 that is fixed on the shell.
Described reset button assembly comprises reset button 4, copper connecting rod 5 and the moving magnet 2 that connects successively, is set with back-moving spring 3 and insulation spacer 6 on the described copper connecting rod 5, and embeds location in the horizontal slideway of being offered on the circuit board 1 25.Like this, reset button 4, back-moving spring 3 and insulation spacer 6 are positioned at circuit board 1 top, can operate and reset, and moving magnet 2 is positioned at circuit board 1 below, and is relative with magnetictrip.Insulation spacer 6 can guarantee that metal back-moving spring 3 insulate mutually with circuit on the circuit board 1.
Described magnetictrip comprises coil rack 24, main tripping coil 16, short circuit tripping coil 15 and iron core 19, described coil 15,16 is wound on the coil rack 24, iron core 19 inserts in the coil rack 24, with iron core 19 bottom rivetings on insulation board 19, and then the both sides of insulation board 19 with rivet 18 rivetings on two movable contact springs 14.Through after the above-mentioned connection, movable contact spring 14 just with insulation board 19 interlocks.Described short circuit tripping coil L415 and main tripping coil L316 and finish with same iron core and to reset and thread off on same coil rack.Described each movable contact spring 14 1 end are all riveted a moving contact 20, and the other end passes zero-sequence transformer 13 simultaneously, after the L utmost point phase line of power supply is passed over-current sensor 12 again, are welded on the circuit board 1.The N utmost point center line of power supply strides across over-current sensor 12 and is welded on the circuit board 1 again.One end of described each static contact 22 is welded on the circuit board 1, and the other end is provided with the fixed contact 21 with described moving contact 20 relative configurations.Described static contact 22 also is provided with terminal screw 23.L utmost point static contact 22 is electrically connected with L utmost point jack by the lead that is fixed on terminal screw 23 places, and N utmost point static contact 22 is electrically connected with N utmost point jack in the same way.
Described iron core 19 two ends are relative with moving magnet 2 with static magnet 17 respectively, and described static magnet 17 is identical with the polarity of moving magnet 2 one side in opposite directions, described electromagnetic trip coil 15 is arranged in when energising state of inhaling mutually with static magnet 17 of iron core 19, and described moving magnet 2 magnetic are better than described static magnet 14.
With reference to Fig. 3, described control circuit comprises control chip IC and controllable silicon VT1.The VG54123 type earth leakage protective device special chip that described control chip IC adopts southwestern integrated circuit Co., Ltd to produce, secondary winding L 1 one ends of described zero-sequence transformer 13 are connected to 3 pin of control chip IC and an end of anti-surge switch S 2, the other end links to each other with the positive pole of partiting dc capacitor C3 and the end of the first divider resistance R3, the negative pole of described partiting dc capacitor C3 is connected to 1 pin of control chip IC and the end of the second divider resistance R2, and the other end of the described second divider resistance R2 is connected to 7 pin of control chip IC; The secondary winding L 2 of described over-current sensor 12 links to each other with the other end of anti-surge switch S 2, is connected threshold circuit D6, the D7 of the restriction induction AC signal voltage of a pair of reverse parallel connection between the other end of its other end and the first divider resistance R3; 4 pin of described control chip IC and 5 pin connect negative pole and the control end of controllable silicon VT1 respectively, meet power supply phase line L behind the main tripping coil L3 of the coil 15 of the anodal series electrical magnetic release of described controllable silicon VT1.Be provided with anti-interference capacitor C2 between 5 pin of described control chip IC and 4 pin.Secondary winding L 1 two ends of described zero-sequence transformer 13 connect the first voltage-stabiliser tube D8, and secondary winding L 2 two ends of described over-current sensor 12 connect the second voltage-stabiliser tube D5.
On the power supply phase line, also be in series with short circuit tripping coil L4, thread off during for line short and use.
Cross thermal overload release K switch 2 at the short circuit tripping coil lead end bimetallic of also connecting, realize dual-overload protection.
The output head anode of described full-wave rectifying circuit D1, D2, D3, D4 meets current-limiting resistance R1 after the 6 pin power supply of control chip IC is given in capacitor C 1 filtering, and another negative pole of output end connects 4 pin of control chip IC.The two ends of passing zero-sequence transformer 13 in phase line connect an analog leakance test circuit.Described analog leakance test circuit is made of switch S 1 series connection of simulation leak resistance R4 and test button 9.At the two ends of the test button switch S 1 thermistor Rt in parallel and the second piezo-resistance RV2.The power end of described full-wave rectifying circuit D1, D2, D3, the D4 first piezo-resistance RV1 in parallel.
Operation principle of the present invention is as follows:
One, energising:
Press reset button 4, moving magnet 2 holds solenoid iron core 19.After decontroling hand, under the tension force effect of back-moving spring 3, the state of solenoid iron core 19 from static magnet 17 adhesives retracted, also drive simultaneously a pair of movable contact spring 14 that insulation board 16 links together, moving contact 20 is contacted with fixed contact 21, thereby connect circuit, finish energising work.
Two, overload protection:
When causing short circuit, the stall of motor oil starvation or power consumption equipment to make moist electric leakage, electric current increase because of wire insulation is aging in the circuit loop, the secondary winding L 2 of over-current sensor 12 will induce faint signal voltage, when signal voltage is higher than the threshold voltage 0.7V of diode D6, D7, diode D6, D7 conducting, this signal voltage just can be delivered to the input pin 1,4 of control chip IC by diode D6, D7, resistance R 3, capacitor C 3; Amplify, compare, overturn and export by 5 pin through control chip IC for high level, trigger controllable silicon VT1 conducting, the positive half cycle current of L utmost point alternating current is passed through from main electromagnetic trip coil L3, in main electromagnetic trip coil L3, produce, and static magnet 17 magnetic fields opposite electromagnetic field identical, make that electromagnetic trip mechanism threads off rapidly, deenergization with moving magnet 2 magnetic fields.
Three, earth leakage protective:
When electric leakage being arranged in the circuit loop or has the people to get an electric shock because of carelessness, the secondary winding L 1 of zero-sequence transformer 13 will induce faint electric leakage signal voltage, this signal voltage is delivered to the input pin 1,3 of control chip IC by capacitor C 3, amplify, compare, overturn and export by 5 pin through control chip IC for high level, trigger controllable silicon VT1 conducting, electric current is passed through from electromagnetic trip coil L3, in electromagnetic trip coil L3, produce, and static magnet 17 magnetic fields opposite electromagnetic field identical, make that electromagnetic trip mechanism threads off rapidly, deenergization with moving magnet 2 magnetic fields.
Four, leak(age) test:
When pressing test button 4; the analog leakance test circuit turn-on; the phase line by zero-sequence transformer 12 and the electric current of center line are just unequal; secondary L1 in zero-sequence transformer will induce faint voltage signal; the same with the earth leakage protective course of work, electromagnetic trip mechanism threads off rapidly, deenergization.
Five, overvoltage protection:
When circuit produced overvoltage, the second piezo-resistance RV2 became conducting state from high-impedance state, the also conducting of analog leakance test circuit, and the same with the leak(age) test course of work, electromagnetic trip mechanism threads off rapidly, deenergization.
Six, overtemperature protection:
When circuit produced overheated (80～90 degree), negative tempperature coefficient thermistor Rt became low resistive state, the also conducting of analog leakance test circuit, and the same with the leak(age) test course of work, electromagnetic trip mechanism threads off rapidly, deenergization
Seven, short-circuit protection:
When short circuit appears in circuit, short circuit current by short circuit tripping coil L4,, moment produces, and static magnet 17 magnetic fields opposite electromagnetic field identical with moving magnet 2 magnetic fields in short circuit tripping coil L4, makes that electromagnetic trip mechanism threads off rapidly, deenergization.
What should be understood that is: above-mentioned enforcement is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (13)
1, multifunctional fireproofing over loading protecting socket; comprise the over-current sensor (12), zero-sequence transformer (13), test button (9), reset button assembly, control circuit, magnetictrip, the two pairs of static contacts (22) that correspond respectively to the N utmost point and the L utmost point and the movable contact spring (14) that are arranged on the circuit board (1); and a static magnet (17) that is fixed on the shell, it is characterized in that:
Described reset button assembly comprises reset button (4), connecting rod (5) and the moving magnet (2) that connects successively, is set with back-moving spring (3) on the described connecting rod (5); Described magnetictrip comprises electromagnetic trip coil (15), coil rack (24) and iron core (19), and by an insulation board (16) and described movable contact spring (14) interlock; Described each movable contact spring (14) one end are provided with a moving contact (20), and the other end of L utmost point movable contact spring (14) is welded on formation L utmost point power connector end on the circuit board after passing zero-sequence transformer (13) and over-current sensor (12); The other end of N utmost point movable contact spring (14) passes to walk around after the bending of zero-sequence transformer (13) back to be welded on behind the over-current sensor and forms N utmost point power connector end on the circuit board; One end of described each static contact (22) is arranged on the circuit board (1), the other end is provided with the fixed contact (21) with the relative configuration of described moving contact (20), and L utmost point static contact (22) is electrically connected with L utmost point jack, and N utmost point static contact (22) is electrically connected with N utmost point jack; Described iron core (19) two ends are relative with moving magnet (2) with static magnet (17) respectively, and described static magnet (17) is identical with the polarity of moving magnet (2) one side in opposite directions, described electromagnetic trip coil (15) is arranged in the state that when energising iron core (19) and static magnet (17) are inhaled mutually, and described moving magnet (2) magnetic is better than described static magnet (14).
2, multifunctional fireproofing over loading protecting socket as claimed in claim 1 is characterized in that described control circuit comprises and is used to receive the signal of telecommunication of described zero-sequence transformer (13) and over-current sensor (12) secondary winding and the control chip (IC) of the back output triggering signal that compares, amplifies, overturns and make the controllable silicon (VT1) of the positive half cycle of alternating current by electromagnetic trip coil (16) under the effect of control chip (IC) triggering signal.
3, multifunctional fireproofing over loading protecting socket as claimed in claim 2, it is characterized in that described control chip (IC) is the VG54123 type, secondary winding (L1) end of described zero-sequence transformer (13) is connected to 3 pin of control chip (IC) and an end of anti-surge switch (S2), the other end links to each other with the positive pole of partiting dc capacitor (C3) and an end of divider resistance (R3), the negative pole of described partiting dc capacitor (C3) is connected to 1 pin of control chip (IC) and adjusts an end of resistance (R2), and the other end of described adjustment resistance (R2) is connected to 7 pin of control chip (IC); One end of the secondary winding (L2) of described over-current sensor (12) links to each other with the other end of anti-surge switch (S2), is connected the threshold circuit (D6, D7) of the restriction induction AC signal voltage of a pair of reverse parallel connection between the other end of the other end and divider resistance (R3); 4 pin of described control chip (IC) and 5 pin connect the negative pole and the control utmost point of controllable silicon (VT1) respectively, connect power supply phase line (L) behind the positive pole series connection electromagnetism tripping coil (L3) of described controllable silicon (VT1).
4, multifunctional fireproofing over loading protecting socket as claimed in claim 3 is characterized in that being provided with anti-interference capacitor (C2) between 5 pin of described control chip (IC) and 4 pin.
5, multifunctional fireproofing over loading protecting socket as claimed in claim 4; secondary winding (L1) two ends that it is characterized in that described zero-sequence transformer (13) connect first voltage-stabiliser tube (D8), and secondary winding (L2) two ends of described over-current sensor (12) connect second voltage-stabiliser tube (D5).
6, multifunctional fireproofing over loading protecting socket as claimed in claim 3 is characterized in that also being in series with a short circuit tripping coil (L4) on the power supply phase line, described short circuit tripping coil (L4) is one of them tripping coil of electromagnetic trip coil (15).
7, multifunctional fireproofing over loading protecting socket as claimed in claim 6; it is characterized in that between power supply phase line and controllable silicon (VT1) positive pole, connecting the main tripping coil (L3) of an electromagnetic trip coil; the negative pole of controllable silicon (VT1) connects the negative pole of rectifier bridge, thereby constitutes the loop that the positive half cycle of alternating current passes through.
8, multifunctional fireproofing over loading protecting socket as claimed in claim 6 is characterized in that the bimetallic thermal overload release (K2) of also connecting on the power supply phase line.
9, multifunctional fireproofing over loading protecting socket as claimed in claim 6 is characterized in that input 1 end, 3 ends of the full-wave rectifying circuit (D1, D2, D3, D4) in the control circuit provide operating voltage for described control chip (IC) when operate as normal; The output head anode of described full-wave rectifying circuit (D1, D2, D3, D4) connects 6 pin that are connected to control chip (IC) behind the current-limiting resistance (R1), and negative pole of output end connects 4 pin of control chip (IC).
10, multifunctional fireproofing over loading protecting socket as claimed in claim 9 is characterized in that also connecting a filter capacitor (C1) between 6 pin of described control chip (IC) and 4 pin.
11, multifunctional fireproofing over loading protecting socket as claimed in claim 10, it is characterized in that the two ends of passing through zero-sequence transformer (13) in phase line connect an analog leakance test circuit, described analog leakance test circuit is made of switch (S1) series connection of simulation leak resistance (R4) and test button (9); Described analog leakance test circuit two ends are connected across simultaneously to be passed on the zero-sequence transformer center line in front, and the other end is connected across on the phase line of passing the zero-sequence transformer back.
12, multifunctional fireproofing over loading protecting socket as claimed in claim 11 is characterized in that two ends thermistor (Rt) in parallel and second piezo-resistance (RV2) of described test button switch (S1).
13, multifunctional fireproofing over loading protecting socket as claimed in claim 10 is characterized in that power line two ends first piezo-resistance in parallel (RV1) of described full-wave rectifying circuit (D1, D2, D3, D4) insert power line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610053983A CN100590937C (en) | 2006-10-26 | 2006-10-26 | Multifunctional fireproofing over loading protecting socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610053983A CN100590937C (en) | 2006-10-26 | 2006-10-26 | Multifunctional fireproofing over loading protecting socket |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1967950A CN1967950A (en) | 2007-05-23 |
| CN100590937C true CN100590937C (en) | 2010-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610053983A Active CN100590937C (en) | 2006-10-26 | 2006-10-26 | Multifunctional fireproofing over loading protecting socket |
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| CN (1) | CN100590937C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7649727B2 (en) * | 2007-10-18 | 2010-01-19 | Elbex Video Ltd. | Method and apparatus for remotely operating AC powered appliances from video interphones or shopping terminals |
| CN101651273B (en) * | 2008-08-13 | 2011-08-03 | 浙江正泰建筑电器有限公司 | Single magnet type electric leakage protection socket |
| CN101651272B (en) * | 2008-08-13 | 2011-08-03 | 浙江正泰建筑电器有限公司 | Fire-proof and electric leakage-proof safety plug |
| CN112719474B (en) * | 2021-01-21 | 2022-11-15 | 深圳市精锋光学五金制品有限公司 | Clamping force self-adjusting gear hobbing clamp for gear hobbing machine tool |
| CN114883093B (en) * | 2022-07-07 | 2022-10-04 | 徐州派特控制技术有限公司 | Fuse is used in voltage transformer protection based on engineering machine tool electrical system |
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| CN1967950A (en) | 2007-05-23 |
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Effective date of registration: 20081219 Address after: Liushi CHINT Industrial Park, Zhejiang, Yueqing Province, China: 325604 Applicant after: Zhejiang Chint Building Electrics Co., Ltd. Address before: Liushi CHINT Industrial Park, Zhejiang, Yueqing Province, China: 325604 Applicant before: Chint Group Co., Ltd. |
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Owner name: ZHEJIANG PROVINCE ZHENGTAI BUILDING ELECTRICAL APP Free format text: FORMER OWNER: ZHENGTAI CO., LTD. Effective date: 20081219 |
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